My life fitness 9500HR display did not light up. I replaced the battery but it still doesn't work. Could it be the alternator? What should I do next?

Test and check control panel and wiring harness

Replacement Parts for Fitness Exercise Equipment at SPORTSMITH

If the battery continues to fail, I would check the alternator brushes and see if they need to be replaced. Chances are they are worn and the battery is not being recharged sufficiently.

Battery 6 Volt 2 5 Amp Hr LifeFitness 0017 00003 0685 SPORTSMITH net

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The Lifefitness Lifesyscle 9500HR battery location is at in the lower portion of the recumbent bike. This is a 1/2 to one hour task for most do it yourself'er.
In order to gain access to the battery compartment,you has to remove the pedals.
The center cover has to be remove.
The 6V battery will be within 12" from the pedals.

Additional reference: Lifecycle Battery 0819-0012 Model Description Terminal Volts AH L W H Lbs Price 0819-0012 Fits Lifecycle Stairmaster series 4200, 4400 - Lifecycle Lifefitness CT8500, CT9100, 9500HR, 95Ci - Star Trac 5300/6300, 5400/6400, StarTrac 6100 Pro, 6200 Elite, ET4600 (0819-0012 replaces the 0819-1006) F2 6 2.5 4.48 1.81 2.75 2 $19.80

check the swicth home and the fuse of 0.3 amp and the capacitor

no there is a problem with the console and it will need replaced

If this unit has not been used for that period of time then the 6v batt has died ans needs replacing call National Gym Parts @ 1-800-496-7278 to order part# LC001.5
HERE IS THE PROCEDURE TO REPLACE THE BATT:
Tilt the bike on its side, remove mounting screws securing the battery to the bracket. Remove the battery just enough to access and disconnect the black (neg) wire from the (-) terminal and the red (pos) wire form the (+) terminal. Replace battery and reverse procedure when installing battery

Every time I have gotten this message, I have had to replace the motor controller.

What battery?

This mean that you unit is not equiped with a receiver inside the treadmill. Some models that was an option. Polar is the only brand that works with Lifefitness. You may have a bad upper display board. You can buy a replacement for a small amount of money.

I’m happy to help further over the phone at https://www.6ya.com/expert/howard_079189dd4959a511